增容剂对聚对苯二甲酸乙二酯/聚丙烯共混体系结构流变学的影响  

EFFECT OF COMPATIBILIZER ON STRUCTURAL RHEOLOGY OF PP/PET BLENDS

作　　者：吴德峰[1] 曹健[1] 吴兰峰[1] 张明[1] 

机构地区：[1]扬州大学化学化工学院,扬州225002

出　　处：《高分子学报》2007年第7期609-614,共6页Acta Polymerica Sinica

摘　　要：采用马来酸酐接枝聚丙烯(PP-g-MAH)对聚丙烯/聚对苯二甲酸乙二酯(PP/PET)共混体系进行增容,研究了增容前后复合体系的相形态和流变行为的变化.结果表明,共混体系中当PP组分为分散相时,增容剂能够显著减小PP液滴尺寸,使其形状松弛时间减小,变形与破裂的剪切敏感性降低;当共混体系两组分配比处于临界相反转点周围时,增容剂则会导致其内部部分双连续与“海-岛”结构共存的复杂相形态消失,低频区模量频率依赖性的增加表明体系内部界面结合程度的增加;而当共混体系中的PET组分为分散相时,增容剂的引入对体系结构流变学影响较小,表明增容效果不大.The maleic anhydride grafted polypropylene （PP-g-MAH） was used as a compatibilizer to improve the immiscible phase morphology of polypropylene/poly（ethylere terephthalate）（PP/PET） blends. The effect of PP-g-MAH on the phase morphology and structural rheology of the blends was studied. The results show that for PP/PET blends with PET-rich composition, the addition of PP-g-MAH reduces the dispersed PP particle size remarkably, leading to large change in the shape relaxation and deformation as well as break-up behavior of PP drops. For PP/ PET blends with the components around the phase inversion point, the coexistence of phase morphology of ‘ seaisland＇ and cocontinuous structure disappears with addition of PP-g-MAH. The enhancement in dependency of low-frequency modulus on frequency also indicates that phase interactions increase due to the compatible effect. However, for PP/PET blends with rich PP component, the addition of PP-g-MAH nearly has no influence on both the morphology and rheology.

关 键 词：聚对苯二甲酸乙二酯 聚丙烯 增容剂 相形态 结构流变学 

分 类 号：O631.3[理学—高分子化学]